Erro na compilação do projeto

Estou com esse erro quando tento compilar no NetBeans 6.6.1:

C:\Documents and Settings\Lynus\Meus documentos\NetBeansProjects\Projeto\src\controle\MySQLServidor\ControleUsuarioMySQLServidor.java:14: package sun.org.mozilla.javascript.internal does not exist

import sun.org.mozilla.javascript.internal.EcmaError;

Note: Some input files use or override a deprecated API.

Note: Recompile with -Xlint:deprecation for details.

Note: Some input files use unchecked or unsafe operations.

Note: Recompile with -Xlint:unchecked for details.

1 error

C:\Documents and Settings\Lynus\Meus documentos\NetBeansProjects\Projeto\nbproject\build-impl.xml:531: The following error occurred while executing this line:

C:\Documents and Settings\Lynus\Meus documentos\NetBeansProjects\Projeto\nbproject\build-impl.xml:261: Compile failed; see the compiler error output for details.